Plant aldehyde dehydrogenase family 3 members F1, H1, and I1 and related proteins. Aldehyde dehydrogenase family members 3F1, 3H1, and 3I1 (ALDH3F1, ALDH3H1, and ALDH3I1), and similar plant sequences, are in this CD. In Arabidopsis thaliana, stress-regulated expression of ALDH3I1 was observed in leaves and osmotic stress expression of ALDH3H1 was observed in root tissue, whereas, ALDH3F1 expression was not stress responsive. Functional analysis of ALDH3I1 suggest it may be involved in a detoxification pathway in plants that limits aldehyde accumulation and oxidative stress.